Purpose : To evaluate surface configuration of intervertebral disc on three dimensional CT. Materials andMethods : Three dimensional surface images reconstructed from CT scans (1 mm thick) of 20 discs in 14 healthyadults were reviewed. Disc surface was classified into peripheral and central zones in contact with consecutiveperipheral ring and central endplate. Local irregularity incidence, pattern in radial, concentric, or mixed form,size, location, and extension were observed. Incidence and severity ranges in 4 grades of general irregularity,and peripheral width relative to central radius were evaluated. Results : Normal disc mostly showed smooth surfacewith few display of small local irregularity (6/20) which was mainly radial in pattern (4/5), posterolaterallylocated (4/6), and confined within peripheral zone (5/6). General irregularity displayed (5/20) was all grade Iand peripheral width was 0.82 of central radius. Conclusion : Normal disc shows smooth surface but few may displaysmall local irregularity maybe due to very early degenerative change.